Experimental packages are new packages or experimental modifications made to mature packages. Unity doesnât support Experimental packages because theyâre in the early stages of development.
Note: Before Unity Editor version 2021.1, the Package Manager used the âPreviewâ state to describe packages that are experimental or risky but otherwise mature. The Package Manager used the âPreviewâ state to describe packages that had not yet been fully validated as safe to use in production. Starting with 2021.1, the âPreviewâ state no longer exists, and packages can either be âExperimentalâ or âPre-release.â This provides a clearer distinction between packages that are mature but risky to use, and packages that are almost fully mature.
Experimental packages can go through many changes before theyâre ready for release in a specific version of Unity. At some point in the future, they might pass the verification requirements but they might also become deprecated instead. Because there is no guarantee for future support, you shouldnât use experimental packages in production.
Packages in experimental state donât usually appear in the Unity Registry context of the Package Manager, even though theyâre on Unityâs official package registry server. These packages arenât discoverable in the Package Manager window because:
Experimental packages that arenât discoverable can still appear in the Package Manager window if you already installed them in your project or installed them as dependencies of supported packages. However, theyâre hidden so that you donât discover them by accident and use them without realizing the risks. If they do appear in the Editor, theyâre always marked in the Package Manager window with the label (details view) and the label (list view). Also, the following menu appears as a warning in the Editor:
The Experimental Packages In Use menu appears as a warning in the toolbarYou can open the Experimental Packages In Use menu and select Dismiss if you donât want to see this warning for this project. You can also open the menu and select Show Experimental Packages to open the Package Manager with a filtered list of the experimental packages in your project.
For a list of stable packages verified for this release, see Released packages.
For more information about package states, see Package states and lifecycle.
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